isalnum, isalnum_l — test for an alphanumeric character
pthread_attr_setschedpolicy — set the schedpolicy attribute (REALTIME THREADS)
pthread_mutexattr_setprotocol — set the protocol attribute of the mutex attributes object (REALTIME THREADS)
endservent, getservbyname, getservbyport, getservent, setservent — network services database functions
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